Java Io

timeout

Hopefully a quick one to answer but what JavaIO class do I use to copy general files.

What i mean is i know how to open a stream and get it to read a file and output to another.

(just simple code, plz don't comment on too much)
public void copy(file a, file b){
bufferreader in = new bufferreader(a);
bufferwriter out = new bufferwriter(b);

while out != null
out.append();
}

The problem is this is only text, like a backup program. What I want to do is be able to copy any file type i.e. .txt, .wav,.avi,.pdf,.doc ect.

Any help welcomed good or bad,
Timeout

seamus

Copying a file byte for byte should work fine. Whichever Reader reads the file as bytes, and whichever Writer writes the file as bytes should do the trick.

Alternatively, have a look at the File class, and it's associated FileReader and FileWriter classes, they may have it already written for you (and probably do).

rob1891

URL answer = google("java copy file");

I crack myself up! Have a read of:

http://www.oreilly.com/catalog/jenut/examples/FileCopy.java

It's heavily commented, the action is here:

    FileInputStream from = null;  // Stream to read from source
    FileOutputStream to = null;   // Stream to write to destination
    try {
      from = new FileInputStream(from_file);  // Create input stream
      to = new FileOutputStream(to_file);     // Create output stream
      byte[] buffer = new byte[4096];         // A buffer to hold file contents
      int bytes_read;                         // How many bytes in buffer
      // Read a chunk of bytes into the buffer, then write them out, 
      // looping until we reach the end of the file (when read() returns -1).
      // Note the combination of assignment and comparison in this while
      // loop.  This is a common I/O programming idiom.
      while((bytes_read = from.read(buffer)) != -1) // Read bytes until EOF
        to.write(buffer, 0, bytes_read);            //   write bytes 
    }
    // Always close the streams, even if exceptions were thrown
    finally {
      if (from != null) try { from.close(); } catch (IOException e) { ; }
      if (to != null) try { to.close(); } catch (IOException e) { ; }
    }

Rob

timeout

Thanks that worked fine

Timeout